<!DOCTYPE html>
<html><body>
<canvas id="c" width="800px" height="600px"></canvas>
<script type="text/javascript">
    var canvas = document.getElementById("c");
    var gl = canvas.getContext("webgl2");
    gl.clearColor(1.0, 1.0, 0.0, 1.0);
    gl.clear(gl.COLOR_BUFFER_BIT);
</script>
</body></html>
